<template>
  <div class="login_container">
    <div class="login_box">
      <div class="avatar_box">
        <img src="../assets/logo.png" alt="">
      </div>
      <!-- 表单 -->
      <el-form ref='loginFormRef' :model='loginForm' :rules='loginFormRoules' label-width="0" class="login_form">
        <!-- 用户名 -->
        <el-form-item prop='username'>
          <el-input v-model='loginForm.username' prefix-icon="iconfont icon-user"></el-input>
        </el-form-item>
        <!-- 密码 -->
        <el-form-item prop='password'>
          <el-input v-model='loginForm.password' prefix-icon="iconfont icon-3702mima" type="password"></el-input>
        </el-form-item>
        <!-- 按钮 -->
        <el-form-item class="btns">
          <el-button type="primary" @click='login'>登录</el-button>
          <el-button type="info" @click='resetLoginForm'>重置</el-button>
        </el-form-item>
      </el-form>
    </div>
  </div>
</template>

<script>
export default {
  data() {
    return {
      // 这里是表单数据绑定对象
      loginForm: {
        username: 'admin',
        password: '123456'
      },
      // 这是表单验证规则对象
      loginFormRoules: {
        //   验证用户名是否合法
        username: [
          { required: true, message: '请输入用户名', trigger: 'blur' },
          { min: 3, max: 10, message: '长度在 3 到 10 个字符', trigger: 'blur' }
        ],
        // 验证密码是否合法
        password: [
          { required: true, message: '请输入密码', trigger: 'blur' },
          { min: 6, max: 15, message: '长度在 6 到 15 个字符', trigger: 'blur' }
        ]
      }
    }
  },
  methods: {
    //   点击重置按钮，重置表单
    resetLoginForm() {
      this.$refs.loginFormRef.resetFields()
    },
    // 登录按钮
    login() {
      this.$refs.loginFormRef.validate(async (valid) => {
        if (!valid) return false
        var { data: res } = await this.$http.post('login', this.loginForm)
        // console.log(res)
        if (res.meta.status !== 200) {
          console.log(res.meta.msg)
          //   弹窗this.$message
          return this.$message.error('登录失败！' + res.meta.msg)
        }
        this.$message.success('登陆成功')
        // 1.将登陆成功的用户token，保存到客户端的sessionStorage中
        //  1.1 项目中除了登录以外的接口，必须在登陆之后才可以访问
        //  1.2 token只应该在当前网站打开期间生效，所以保存在sessionStorage中
        // 2.通过编程式导航跳转后台主页，路由地址是/home
        window.sessionStorage.setItem('token', res.data.token)
        window.sessionStorage.setItem('username', res.data.username)
        this.$router.push('/home')
      })
    }
  }
}
</script>

<style lang="less" scoped>
.login_container {
  height: 100%;
  background-color: #2b4b6b;
}
.login_box {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  width: 450px;
  height: 300px;
  background-color: #fff;
  border-radius: 5px;
  .avatar_box {
    position: absolute;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 130px;
    height: 130px;
    border: 1px solid #eee;
    background-color: #fff;
    border-radius: 50%;
    padding: 10px;
    box-shadow: 0 0 10px #ddd;
    img {
      width: 100%;
      height: 100%;
      border-radius: 50%;
      background-color: #eee;
    }
  }
}
.btns {
  display: flex;
  justify-content: flex-end;
}
.login_form {
  position: absolute;
  bottom: 0;
  width: 100%;
  padding: 0 20px;
  box-sizing: border-box;
}
</style>
